To provide a fall prevention structure for a screw surely preventing a fall of a screw without raising the manufacturing cost of a product.
Before connecting a first component 12a and a second component 12b to each other, the screw 10 is inserted from an insertion opening 11a of a cylindrical body 11. When the screw 10 is inserted, even if the insertion position is displaced, a male screw part 10d is guided to a shaft housing part 21 by a tapered surface 23. When the male screw part 10d passes through the shaft housing part 21, since a diameter L of the male screw part 10d is larger than a diameter M of the shaft housing part 21, the cylindrical body 11 is elastically deformed by the pressure of the male screw part 10d, and a slit 13 enlarges, and the diameter M of the shaft housing part 21 becomes the diameter L of the male screw part 10d or more. The male screw part 10d thereby passes through the shaft housing part 21.
Next Patent: FLUID PRESSURE CIRCUIT